JPH0683870B2 - Wire feeder - Google Patents

Description

TECHNICAL FIELD The present invention relates to a wire feeding device for press working.

[Conventional technology]

Japanese Patent No. 182278 (Japanese Patent Publication No. 4-4617) discloses that a bush inserted into an outer cylinder is formed with a tapered through hole, and three steel balls are provided in the tapered through hole. There is disclosed a wire rod feeding device which is arranged on the same circumference and holds a wire rod by these three steel balls.

[Problems to be solved by the invention]

However, when a plurality of wire rod feeders having the above-mentioned configuration are arranged and a plurality of wire rods are fed at the same time for riveting, the pitch between the wire rods cannot be narrowed to the outer diameter dimension of the outer cylinder or less. Therefore, when riveting is performed at a pitch equal to or smaller than the outer diameter of the outer cylinder, it is necessary to move the product and perform it at each location, which causes a problem of poor work efficiency.

Further, the wire rod feeding device has a problem that the fed wire rod is slightly pulled back and the feed dimension may not be constant.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a wire rod feeding device that can reliably feed a plurality of wire rods to a plurality of adjacent locations at a constant size at a time. .

[Means for solving problems]

A wire rod feeding device of the present invention for achieving the above object is reciprocally fitted to a guide post arranged in the wire rod feeding direction, and a core mounting hole formed in the wire rod feeding direction, A feed holder formed by facing tapered surfaces in a direction which is continuous with the child mounting hole and is orthogonal to the wire feeding direction,
A drive device that reciprocates the feed holder by a predetermined wire feed amount, a plurality of cores that are slidably inserted in the core mounting holes and arranged along the tapered surface, and the tapered surface. Correspondingly, a pair of nipping rollers rotatably held in roller chambers formed in the cores and outer circumferences of the pair of nipping rollers for nipping the wire rods penetrating the cores and the feed holders, respectively. , And a spring for urging the cores to make contact with the tapered surfaces, respectively.

Further, in the wire rod feeding device having the above structure, a brake pin for pressing and fixing a wire rod fed by a predetermined wire rod feed amount by the reciprocating movement of the feed holder, an operating pin for operating the brake pin, and a reciprocating movement of the wire rod feed of the feed holder. A pressing mechanism that presses the actuating pin in synchronism is additionally provided.

[Action]

According to the configuration of the present invention, when the feed holder moves by a predetermined wire feed amount, the pair of nipping rollers that abut the tapered surface of the feed holder are further pressed by the taper surfaces, and the nipping force on the wire increases. At the same time, the cores are pushed down against the compression force of the springs, and the wire rods sandwiched by the sandwiching rollers are reliably fed by a predetermined wire rod feed amount. When the feed holder returns, the pressing force applied to the nipping roller by the tapered surface ceases to act, and the nipping roller rolls in the roller chamber and the wire is left as it is.

At this time, the brake pin pressed by the pressing mechanism synchronized with the reciprocating movement of the feed holder presses and fixes each wire rod to prevent the wire rod from returning.

〔Example〕

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 shows a schematic structure of a wire feeding / cutting device to which the present invention is applied. This device is a device used for riveting, and is a device for feeding and cutting a wire material, which is a material, by a predetermined wire feed amount, and providing it as a rivet material in the next step. This device is divided into a wire rod feeding unit 1, a brake unit 2, and a wire rod cutting unit 3 according to each function.

The wire rod feeding unit 1 has a cam 13 that is vertically movable in the wire rod feeding direction, and a cam surface 4a that abuts a cam surface 13a of the cam 13, and is a member 4 that is movable left and right, and a left and right member 4 of the member 4. A lever 5 that rotates in accordance with the movement, a feed holder 7 that is held by a guide post 6 so as to be vertically movable, and that is pressed by the lever 5 and is vertically movable, and a spring 8 that biases the feed holder 7 upward. Consists of.

In the feed holder 7, a core mounting hole 7A is formed in the vertical direction, and a tapered surface 7B continuous with the core mounting hole 7A is formed in an opposed shape. The taper surface 7B is formed in a direction orthogonal to the vertical direction, which is the feeding direction of the wire. A core 9 having a trapezoidal shape following the mounting portion to be mounted in the core mounting hole 7A and a rectangular cross section of a portion corresponding to the tapered surface 7B is provided along the forming direction of the tapered surface 7B. Two pieces are arranged and each core 9 is biased upward by the spring 11.

As shown in FIG. 2, the core 9 is formed with a roller chamber 9C having an opening window in a trapezoidal tapered portion 9A corresponding to the tapered surface 7B, and a pair of nipping rollers 10, 1
0 is rotatably held. A wire rod 12 serving as a rivet material is inserted through each core 9, passes through between the pair of holding rollers 10 held in the roller chamber 9C, and penetrates the feed holder 7. The nipping rollers 10, 10 rotatably held in the roller chamber 9C come into contact with the tapered surface 7B of the feed holder 7 so that the nipping rollers 10, 10 roll in the central portions of each other,
It is designed to hold the wire rod 12.

When the cam 13 descends in the direction of the arrow in FIG. 1, the cam surface 13a of the cam 13 and the cam surface 4a of the member 4 abut against each other, the member 4 moves in the right direction of the drawing, and the lever 5 moves in the direction of the drawing. Rotate. The lever 5 pushes down the feed holder 7. When the feed holder 7 descends, the nipping rollers 10, 10 that contact the tapered surface 7B of the feed holder 7 are further pressed, and roll to the center to securely hold the wire rods 12, respectively. Therefore,
As the feed holder 7 descends, each wire 12 is fed downward.

When the cam 13 moves upward, the above members move in the directions opposite to the arrows in the drawing, and the feed holder 7 rises. At this time, due to the taper surface 7B of the feed holder 7, the pressing force against the nip rollers 10, 10 does not act. Therefore, each wire 12 is left as it is. Therefore, each time the feed holder 7 moves up and down, the wire 12 is fed downward by a predetermined feed amount.

As shown in FIGS. 1 and 3, the brake unit 2 includes a cam 21 that is vertically movable and a cam surface 22a that abuts on a cam surface 21a of the cam 21.
And a movable member 22 that is movable left and right, a working pin 23 that is movably fitted in a fixed block 25 and is pressed by the member 22, and a wire rod 12 that is fitted in the block 25 and is vertically inserted. The cutting die 26 has a plurality of (two) small holes, and the brake pin 24 is loosely fitted to the cutting die 26 so as to be movable left and right and pressed by the operating pin 23.

The plurality of small holes of the cutting die 26 through which the wire 12 is inserted are connected to the holes into which the brake pins 24 are loosely fitted, and the inserted wire 12 is inserted.
The brake pin 24 can press the side surface of the. Further, the pressure receiving surfaces at both ends of the operating pin 23 have a spherical shape.

When the cam 21 descends in the direction of the arrow in FIG. 1, the cam surface 21a of the cam 21 and the cam surface 22a of the member 22 abut against each other to move the member 22 leftward in the drawing and press the operating pin 23. The brake pin 24 pressed by the operation pin 23 presses and fixes the plurality of wire rods 12 inserted in the cutting die 26.

At this time, even if the wire diameter of the wire rod 12 is slightly different, the brake pin 24 pressed by the spherical end surface of the operating pin 23 is
The axial direction of the wire 12 is slightly changed to closely adhere to the wire 12, and the wire 12 is pressed with the same pressing force to be securely fixed. The brake unit 2 presses and fixes the wire rod 12 so that the wire rod 12 is not pulled back when the feed holder 7 of the wire rod feed unit 1 is raised.

The wire rod cutting unit 3 includes a cam 31 that is vertically movable and a cutting cam 32 that has a cam surface 32a that abuts a cam surface 31a of the cam 31 and is movable left and right. The cutting cam 32 has a small hole 33 into which the wire 12 is inserted, and an upper end of the small hole 33 has a cutting edge 34 for cutting the wire 12.

The wire rod 12 fed downward by the wire rod feeder 1 is a cutting cam.
It is inserted into 32 small holes 33. Next, when the cam 31 descends in the direction of the arrow in FIG. 1, the cutting cam 32 moves to the right due to the abutment of the cam surfaces 31a and 32a, and the wire 12 moves to the cutting edge 34 at the upper end of the small hole 33 and the cutting die. Cut off at 26 and. Cut wire 12
Is carried to the right in the drawing while still entering the small hole 33, and is supplied to the caulking process (not shown) as a fixed-size rivet material.

The timings at which the wire rod feeding unit 1, the brake unit 2, and the wire rod cutting unit 3 respectively operate are cams 13, 21 for driving them,
They are adjusted by 31 and 31, respectively, so that they are synchronized with the press machine.

In the present embodiment, since the wire rod is sandwiched and conveyed by the pair of nipping rollers held by the two cores, a plurality of wire rods arranged close to each other are securely grasped and conveyed at the same time. be able to. In addition, the brake portion that operates in accordance with the operation timing of the wire rod feeding portion can reliably prevent the wire rod from returning and make the wire rod feeding dimension constant. Since the pin that presses the wire rod in the brake part is divided into a relatively short brake pin that contacts the wire rod and an operating pin that has a spherical end surface that presses the brake pin, the wire diameter is slightly different. It is possible to reliably press and fix a plurality of wires with the same pressing force.

In the above embodiment, the device for simultaneously feeding two wire rods has been described, but it goes without saying that the present invention is also applied to a device for simultaneously feeding three or more wire rods.

〔The invention's effect〕

According to the present invention, which has the above-described configuration and operation, the feed holder is formed so that tapered surfaces face each other in a direction orthogonal to the wire feeding direction, and a pair of nipping rollers is provided in a roller chamber formed corresponding to the tapered surfaces. By arranging a plurality of cores rotatably held along the tapered surface, the sandwiching rollers held by the respective cores are aligned and arranged along the tapered surface of the feed holder, and Since the sandwiching roller and the member for holding the sandwiching roller are not arranged in the middle, the minimum distance between the wire rods, which is set when the sandwiching roller is set to the minimum length required for pressing and sandwiching the wire rod, is set. The interval can be freely set, and there is an excellent effect that it is optimal for simultaneously supplying wire rods to a plurality of adjacent locations and performing riveting.

Further, a brake pin that presses and fixes a wire rod fed by a predetermined wire rod feed amount by the reciprocating movement of the feed holder to the wire rod feeding device having the above-described structure, an operating pin that operates the brake pin, and a wire rod feed reciprocating motion of the feed holder. By attaching a pressing mechanism that presses the operating pin in synchronism with the above, a plurality of wire rods arranged close to each other can be reliably fed at a constant size at the same time, and the work efficiency of press working is greatly improved. It has an excellent effect that can be increased.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment, FIG. 2 is an exploded perspective view showing a core of FIG. 1, and FIGS. 3 (a) and 3 (b) are plan views showing a brake portion of FIG. It is a front sectional view. 1 ... Wire rod feeding part, 2 ... Brake part, 4 ... Member,
5 ... Lever, 6 ... Guide post, 7 ... Feed holder, 7A ... Core mounting hole, 7B ... Tapered surface, 8 ... Spring, 9 ... Core, 9C ... Roller chamber, 10, 10 …… Clamping roller, 11 …… Spring, 12 …… Wire, 21 …… Cam, 22
...... Member, 23 ...... Operating pin, 24 ...... Brake pin, 25 ...
…block.

Claims (2)

[Claims] 1. A core member mounting hole, which is fitted in a guide post arranged in the wire rod feeding direction so as to be able to move forward and backward, and which is formed in the wire rod feeding direction, and which is continuous with the core rod mounting hole. A feed holder having tapered surfaces opposed to each other in a direction orthogonal to, a drive device that reciprocates the feed holder by a predetermined wire feed amount, and a slide holder that is slidably inserted into the core mounting hole. A plurality of cores arranged along the tapered surface, a pair of nipping rollers rotatably held in a roller chamber formed in each core corresponding to the tapered surface, and each core and the feed holder. A wire rod feeding device comprising: a spring for urging the cores so as to bring the outer circumferences of the pair of holding rollers for holding the penetrating wire rods into contact with the tapered surfaces, respectively. 2. A brake pin for pressing and fixing a wire rod fed by a predetermined wire rod feed amount by the reciprocating movement of the feed holder, an operating pin for operating the brake pin, and a reciprocating movement of the wire rod feed of the feed holder, The wire rod feeding device according to claim 1, further comprising: a pressing mechanism that presses the operating pin.